Electric heater.



8.; R. GRIMSHAW & LA MAR R. JONES.

ELECTRIC HEATER.

APPLICATION FILED JULY 27,1916.

Patented Mar. 27, 1917.

u i M m/ ,9 Q mM/ 0 WITNESSES.

ATTORNEYS oi the coils or other parts, and is easily assembled, and whenassembled, is held rigidly in position.

lln t we have shown a modified form of the device 1n which, instead ofusing a plate, such as that shown at 7 in Fig, l, We

make rise of a screen 210. the device the screen serves a triplepurpose, or rather-a tour-told purpose, in that it is a common terminalor conductor for the coils 8 and 9, it tends to sore-snout any objectspassing into the carburetor, it prevents an eXPlOSIOR or gas which mayhave accumulated in the pipe between the carbureter and theheatingdewce, in case of short circuit- 'ing anywhere in theheatingdevice, and it ducting members having threaded portions arrangedto engage the threaded ends of said insulating casing and beingjprovidcdwith openings arranged to receive pipes, means for securing the plpes tosaidcon- "ductin members a screen dis osed in one ,I 5 end or said1nsulat1ngcasmg and-being in electrical contact With one of saidthreaded conducting and members, a plurality of heat ing coils, one ofsaid coils being disposed centrally of said casing and the others ofsaid coils being disposed in a circular lormation around said centralcoil, each of said coils having electrical connection With. said screenat one end, an annular conducting member secured to the inner Wall ofsaid casing and having connection With each of said circularly arrangedcells, a rigid arm extending inwardly from the interior of said casingand being connected to the other coil, and means for connecting each ofsaid coil supporting arms with a source of current.

2. In an electric air heating device, a czising a perforated member atone end of the casing, said perforated member being of conductingmaterial and being grounded, and a heating coil having connection at oneend with said perforated conducting pipe,

and an inwardl extendingconduct U I I in this form of cylindricalcasing, a perforated conr .c

enhance having electrical connection n th the end of the coil, saidconducting arm secured in the Wall ot the casing at l 1 electricalconnection "with a source rent.

3. In an electrical air heating member secured at one end to said can aplurality of heating coils disposed a the'casing, all of said heatingcoils b connected with said perforated condnc member, a plurality ofbindingby said casing, certain or" said coi connected to one of saidbindin the remainder being connected binding post. d. in an electric airh i lindrical casing made conducting ends for said c vided with openingsarran pipes, means for securing sai ends, a perforated plate car" ofsaid casing, a plurality of sets coils disposed Within the casing,heating coils being connected Witn torated' plate, a plurality of binso.

carried by said casing, certain oi said cc being connected With one ofsaid bind posts, and other coils being connected another binding post. 7

' 5'. in an electrical air heating device, a cylindrical casing made ofinsulating mate, rial and being threaded at its ends, conduct-I- ingthreaded members arranged to be secured at each end of said casing, saidthreaded members having openings arranged to receive pipes, meanssecuring the pipes to said conducting members, a pertorated platecarried at one end at said 111- 'sulating casing, a plurality of sets ofheating coils, each of said cells having electrical connection withsaid. plate one end, a plurality of conducting carried by the Wall ofthe casing and extendin inwardly, certain of said coils being connectedwith one of said arms, and other coils being connected with the other ofthe arms, and means for connecting each of said last named arms With asource of current.

